<!doctype html>
<html>
  <head>
    <script type="module">
      import {URLPattern} from 'urlpattern-polyfill';
      if (!window.URLPattern) {
        window.URLPattern = URLPattern;
      }
    </script>
    <script type="module" src="./router_test_code.js"></script>
  </head>
</html>
